Occupational Exposure Assessment Report: Airborne Asbestos Fibers

Transcription

1 June 13, 2016 Occupational Exposure Assessment Report: Airborne Asbestos Fibers VAV Repair Stevenson Hall 1801 E. Cotati Avenue Rohnert Park CA Prepared for: Craig Dawson 1801 E. Cotati Avenue Rohnert Park CA Prepared By: David Brinkerhoff, CIH, CIEC 7625 Sunrise Boulevard, Suite 104 Citrus Heights, CA FACS Project #PJ29642

2 Contents Executive Summary... 1 Introduction... 1 Scope of Work... 1 Background... 1 Site Characterization and Observations... 2 Findings and Results... 3 Conclusions and Recommendations... 3 Limitations... 4 Appendix A: FACS Data Collection Methods Appendix B: Sampling Results Summary and Laboratory Reports Appendix C: Photographs

3 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 1 of 4 Executive Summary Personal air monitoring for airborne fibers was performed during variable air volume (VAV) system inspection and repair activities at select locations within Stevenson Hall on the campus located at 1801 E. Cotati Avenue in Rohnert Park, California. Monitoring was performed at the request and authorization of. Air samples collected by Forensic Analytical Consulting Services Inc. (FACS) indicated worker exposures to airborne fibers were well below the Cal/OSHA PEL or Excursion Limit during the tasks monitored. A more complete discussion of findings, conclusions and recommendations are provided below. Introduction, Inc. was retained by to perform personal air monitoring for airborne fibers during variable air volume (VAV) system inspection and repair activities at selected locations in Stevenson Hall on the campus located at 1801 E. Cotati Avenue in Rohnert Park, California. The purpose of the assessment was to evaluate employee exposure to airborne asbestos fibers in dust that may be disturbed during routine maintenance activities performed by engineers. The assessment was performed by David Brinkerhoff, Certified Industrial Hygienist (CIH), on May 20, This report contains the findings of this industrial hygiene evaluation. Scope of Work The exposure assessment was conducted in accordance with California Division of Occupational Safety and Health (Cal/OSHA) requirements. In the course of this project, FACS conducted the following scope of work: 1. Collection of personal air samples for airborne fibers. Samples were collected during inspection and repair activities to the VAV system equipment that would typically be done by a Building Systems Engineer (BSE) staff. 2. Collection of personal air samples to evaluate potential occupant exposure in areas adjacent to VAV inspection and repair work areas. Samples were collected in the rooms where the tasks described above were conducted. The data collected in the course of the investigation is presented in this report as follows: Appendix A: Data Collection Methodologies Appendix B: Sampling Results (summary tables, laboratory reports, and chain of custody forms) Appendix C: Photographs Background Cal/OSHA requires each employer with a workplace or work operation under Title 8 CCR Section1529 Asbestos, to ensure that a "competent person" conducts an exposure assessment immediately before or at the initiation of the operation to ascertain expected exposures during that operation or workplace.

4 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 2 of 4 An exposure assessment consists of observation and documentation of the tasks performed, measuring airborne fibers in the breathing zone of the employees performing the tasks, and recording the data. When the personal sample results are below the asbestos permissible exposure limit (PEL), a Negative Exposure Assessment (NEA) is established. Once an NEA is established, it can be used on similar future projects when certain conditions are met. Site Characterization and Observations Exposure monitoring was conducted during simulated inspection and repairs to the VAV boxes in Stevenson Hall. Locations and activities conducted during the exposure assessment are summarized below. Observed Tasks, May 20, 2016 VAV Inspection / Repairs Exposure Assessment Stevenson Hall, 1801 E. Cotati Avenue, Rohnert Park, CA Location 1 Conference Room :50 am Begin TWA sample on Building Systems Engineer (BSE). 8:52 am Poly drop sheet are placed on floor and HEPA vacuum is available. BSE removes 3 ceiling tiles and begins troubleshooting VAV box. Finds leaking pneumatic line and repairs with tape. 9:05 am BSE opens panel on VAV box and simulates typical repair by removing damper. Begin excursion limit (EL) sample. 9:14 am BSE begins putting damper back on. He visually inspects connections and closes VAV box. Ceiling tiles are replaced 9:22 am BSE removes ceiling tile and simulates repairing dislodged duct. 9:28 am Ceiling tile is replaced. BSE inspects and wipes down return air registers. 9:31 am BSE removes ceiling tile and simulates inspection. 9:35 am BSE vacuums debris from poly drop sheet. End EL sample. Location 2 Office :56 am BSE remove ceiling tile and begins inspection then damp wipes VAV box and opens access panel. BSE begins removing damper to simulate repair. 10:05 am BSE replaces ceiling tile. Open another ceiling tile at location of next VAV box and inspects. 10:26 am BSE replaces ceiling tile and moves to next inspection location. Location 3 Classroom :58 am BSE removes ceiling tile and begins inspection. 11:00 am Replaces ceiling tile and moves to next location. 11:02 am BSE removes ceiling tile to access VAV box then removes access panel to check damper and actuator. 11:07 am BSE replaces access panel and continues above ceiling inspection. 11:14 am BSE cleans return register. 11:25 am BSE removes ceiling tile and inspects above ceiling 11:30 am Drop cloth is vacuumed and placed in garbage bag. 11:35 am TWA task is complete. Sample pump is removed. Pumps were calibrated before and after sampling to determine average flow rate for -- each sample collected. Pumps were calibrated with a primary standard, Dry-Cal, # The floor in each repair location was lined with polyethylene drop sheet during the exposure assessment. A high efficiency particulate air (HEPA) filter vacuum cleaner was present to clean-up any debris generated during the repair tasks. During the above listed activities, personal monitoring was conducted on EH&S department staff to simulate potential occupant exposures adjacent to work areas.

5 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 3 of 4 It should be noted that no asbestos-containing building materials were disturbed during the observed tasks. Representative photographs are presented in Appendix C. Findings and Results Time Weighted Average Exposure Calculation Occupational exposures are generally represented as a time weighted average (TWA), which is the average exposure concentration across the time period evaluated. Occupational exposure limits are typically given as an 8-hour TWA, which represents the maximum average concentration a worker may be exposed to over an 8-hour work day. In addition, some compounds have a short-term exposure limit (STEL) or excursion limit (EL). Full-task sampling (~3 hours) rather than full-shift (~8 hours) sampling was performed during this assessment to determine exposures specifically during VAV system inspection and repair tasks. The TWA concentration for a full shift was calculated assuming similar exposures during the part of the shift that was not monitored. Short term sampling (over a 30 minute time-frame) was also performed during the assessment. Direct Comparison to Cal/OSHA PELs Personal air samples for airborne fibers were collected from one worker performing VAV system inspection and repair activities and from one occupant/bystander. In addition, one 30 minute excursion sample was collected during work most likely to generate dust. Results of exposure monitoring (see Appendix B, Table 1) indicate that during the simulation of VAV system inspection and repair tasks, employee exposure did not exceed the Cal/OSHA asbestos PEL of 0.1 f/cc as an 8-hour TWA or the Excursion Limit of 1 f/cc for airborne fibers. The 8-hour TWA exposures were calculated with the assumption that there was similar exposure during the portions of the 8 hour shift not monitored. Assuming no exposure during periods not monitored would result in lower TWA exposures. All samples were analyzed first by phase contrast microscopy (PCM) and then reanalyzed by transmission electron microscopy (TEM). TEM analysis counts only asbestos fibers (as opposed to PCM which counts all fibers) and therefore is a more accurate method for determining airborne asbestos fiber concentrations. No asbestos fibers were detected in the sample reanalyzed by TEM. Conclusions and Recommendations The following recommendations are made based on this investigation: 1. All personal air sample results were below the Cal/OSHA PEL or EL for airborne fibers. When reanalyzed by TEM, no asbestos was detected in any of the samples. 2. Employees represented by this exposure assessment are not required to wear respirators during the tasks monitored.

6 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 4 of 4 3. Exposure monitoring should be repeated whenever significant changes to processes and/or procedures occur, or a significant increase in work duration occurs. 4. Notify all affected employees of the monitoring results within 15 days of receiving this report either individually in writing or by posting the results in an appropriate location that is accessible to employees. Records should be maintained and be made accessible as detailed in Title 8 CCR Section Limitations This investigation is limited to the conditions and practices observed and information made available to FACS. The methods, conclusions, and recommendations provided are based on FACS judgment, experience and the standard of practice for professional service. They are subject to the limitations and variability inherent in the methodology employed. As with all environmental investigations, this investigation is limited to the defined scope and does not purport to set forth all hazards, nor indicate that other hazards do not exist. Please do not hesitate to contact our office at if you have any additional questions or concerns. Thank you for the opportunity to assist Inc. in promoting a more healthful environment. Respectfully, FORENSIC ANALYTICAL Reviewed by: FORENSIC ANALYTICAL Diana Lutsik Project Manager, Sacramento David Brinkerhoff, CIH, CIEC Director, Sacramento

7 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 Appendix A Appendix A FACS Data Collection Methods Air monitoring was conducted by assembling a sampling train consisting of a portable, battery-operated vacuum pump, a length of Tygon tubing, and a 25-millimeter, open-face, air sampling cassette fitted with a 0.8 micron pore-size, mixed cellulose ester (MCE) particulate filter. Samples were collected by using the vacuum pump to draw air across the filter, thereby trapping airborne particulate. Sample flow rates were calibrated at the start and again at the end of each sampling period. The mean average of these measurements was used as the flow rate submitted to the laboratory to calculate the air volume sampled. Calibration was completed utilizing a DryCal Defender, which is a primary standard. Time Weighted Average (TWA) and 30 minute samples were collected and results compared to the Cal/OSHA 8-hour TWA PEL and Excursion Limit for asbestos fibers. All samples were analyzed by phase contrast microscopy (PCM) utilizing National Institute of Safety and Health (NIOSH) analytical Method 7400, at Forensic Analytical Laboratories, Inc. (FALI) in Hayward, California. PCM analysis reports total airborne fiber concentrations in units of fibers per cubic centimeter of air (f/cc), and does not distinguish between airborne asbestos fibers and other airborne non-asbestos fibers. Therefore, if the PEL for total airborne fibers is less than the asbestos PEL, a NEA can be established. If the results are above the asbestos PEL, further analysis may be required to differentiate between total airborne fibers and asbestos airborne fibers. Samples may be reanalyzed by transmission electron microscopy (TEM) utilizing NIOSH analytical Method TEM analysis counts only asbestos fibers (as opposed to PCM which counts all fibers) and therefore is a more accurate method for determining airborne fiber concentrations. The laboratory reports are attached in Appendix B of this report. The eight-hour time weighted average (TWA) is calculated using the formula below. (C 1 * T 1 ) + (C 2 * T 2 ) + (C n * T n ) 8 Hour TWA = 480 minutes where: C 1 = T 1 = C n = T n = Concentration for the first sampling period Duration for the first sampling period Concentration for each additional sampling period Duration for each additional sampling period Exposure during the time that was not monitored was assumed to be similar to monitored periods.

8 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 Appendix B Appendix B Sample Results Summary and Laboratory Reports Sample No. C C C C C C Table 1: Air Sample Results for Airborne Fibers During VAV Repairs Stevenson Hall, 1801 E. Cotati Avenue, Rohnert Park, CA May 20, 2016 Work Task / Employee Name Simulation of VAV Repairs / Mark Soto Simulating Occupant/Bystander / Michael Kopaigorodsky Simulation of VAV Repairs / Mark Soto Sample Duration (min.) Excursion (fibers/cc) 8-Hour TWA 1 (fibers/cc) TEM Results (asbestos fibers/cc) 165 N/A < N/A < N/A < < Field Blanks N/A N/A N/A N/A Cal/OSHA PEL / EL Notes: 1 Exposure assuming the same exposure to the agent during the sampled and non-sampled portions of the day. The symbol < means less than and the value following indicates the laboratory reporting limit for the analytical method and sample volume. 2 Samples reanalyzed by TEM. Asbestos present below the limit of detection for the method (i.e. no asbestos fibers were detected). N/A Not Applicable

9 Final Report Forensic Analytical Consulting Svcs David Justin Brinkerhoff 7625 Sunrise Blvd. Suite 104 Citrus Heights, CA Job ID/Site: Airborne Fiber Analysis NIOSH 7400 Method, Issue 2, 15 August 1994, counting rules 'A' PJ29642;, 1801 E. Cotati Avenue, Rohnert Park CA Client ID: Report Number: Date Received: Date Analyzed: Date Printed: First Reported: SAC02 A /24/16 05/26/16 05/26/16 05/26/16 FALI Job ID: SAC02 Total Samples Submitted: Total Samples Analyzed: Sample ID Lab Number Date Collected Volume (L) Fibers Fields Fibers/mm 2 LOD F/cc Fibers/cc C /20/ C /20/ C /20/ C /20/ Comments: This result was used to blank correct the other samples on this report. Blank filters are reported only as number of fibers and fields counted. C /20/ Comments: This result was used to blank correct the other samples on this report. Blank filters are reported only as number of fibers and fields counted. C /20/ Tad Thrower, Laboratory Supervisor, Hayward Laboratory Intralaboratory Relative Standard Deviation (Sr) per 100 graticule fields: 5 to 20 fibers: 0.470; >20 to 50 fibers: 0.387; >50 to 100 fibers: Analytical results and reports are generated by Forensic Analytical Laboratories Inc. (FALI) at the request of and for the exclusive use of the person or entity (client) named on such report. Results, reports or copies of same will not be released by FALI to any third party without prior written request from client. This report applies only to the sample(s) tested and results are based upon sample information provided by the client. Supporting laboratory documentation is available upon request. This report must not be reproduced except in full, unless approved by FALI. The client is solely responsible for the use and interpretation of test results and reports requested from Forensic Analytical. This report must not be used by the client to claim product endorsement by NVLAP or any other agency of the U.S. Government. FALI is not able to assess the degree of hazard resulting from materials analyzed. FALI reserves the right to dispose of all samples after a period of thirty (30) days, according to all state and federal guidelines, unless otherwise specified. Samples are not blank corrected unless otherwise noted. All samples were received in acceptable condition unless otherwise noted Depot Road, Suite 409, Hayward, CA / Telephone: (510) (800) 827-FASI / Fax: (510) of 1

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12 ANALYSIS REPORT: ASBESTOS IN AIR Transmission Electron Microscopy NIOSH 7402 Method* Client: Forensic Analytical Consulting Svcs Page: 1 of 1 Contact: David Justin Brinkerhoff Client Number: SAC02 Street: 7625 Sunrise Blvd, Suite 104 Report Number: T City/state/zip: Citrus Heights CA Date Received: 5/27/16 Site: Analyst(s): MF Location: 1801 E Cotati Ave Date Analyzed: 6/1/16 Job ID: PJ29642 Date Reported: 6/1/16 Date collected: 5/20/16 Filter type: 25mm MCE Pore size: μm 0.8 ANALYTICAL RESULTS Client Sample Number C C C C C Lab Sample Number Sample Volume, liters Filter area, mm Grid Opening Area, mm Number of GO's analyzed Total Fibers Counted Asbestos Fibers Counted % Asbestos fibers of Total 0% 0% 0% 0% 13% Analytical sensitivity, f/cc Total Fibers >5μm/cc < <0.016 < Asbestos Fibers >5μm/cc <0.002 <0.002 <0.016 < Asbestos Type(s) Detected** ND ND ND ND CH Mark S. Floyd, Analytical Microscopy Supervisor * NOTE: In the NIOSH 7402 method, only fibers >5 microns in length and >0.25 microns in diameter are counted. ** Asbestos types: CH=chrysotile; AM=amosite; CR=crocidolite; AC=actinolite; TR=tremolite; AN=anthophyllite; ND=none detected. OV=Overloaded, prepared but not analyzed; NA=not analyzed Samples were received in acceptable condition unless otherwise noted. Analytical results relate only to the sample(s) tested and are not blank- or background-corrected unless otherwise noted. Analytical results and reports are generated by Forensic Analytical Laboratories Inc. (FALI) at the request of and for the exclusive use of the person or entity (Client) named on such report. Results, reports or copies of same will not be released by FALI to any thrid party without prior written request from Client. This report applies only to the sample(s) tested. Supporting laboratory documentation is available upon request. This report must not be reproduced except in full with approval from FALI. Client is solely responsible for the use and interpretation of test results and reports requested from FALI. This report must not be used by Client to claim product endorsement by NVLAP or any U.S. government agency. FALI is unable to assess the degree of hazard resulting from materials analyzed. FALI reserves the right to dispose of al samples after a period of 30 days, according to all state and federal guidelines, unless otherwise specified Depot Road, Suite 409, Hayward, California Telephone:

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15 Occupational Exposure Assessment Report: Airborne Fibers 06/13/16 Appendix C Appendix C Photographs Photo #1 Photo #2 Photo #3 Photo #4

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